Question

我通过绘制均匀分布的水平和垂直线在像素图上绘制了一个网格，我正在尝试制作每个矩形网格selectable.

换句话说，如果用户点击网格中的某个矩形，那么它将被存储为单独的像素图。我尝试过使用QRubberBand。

但我无法弄清楚如何将选择限制在所选的特定部分。有没有办法使用PyQt做到这一点？

这是我将网格绘制到像素图上的代码：

class imageSelector(QtGui.QWidget):

    def __init__(self):
        super(imageSelector,self).__init__()
        self.initIS()

    def initIS(self):
        self.pixmap = self.createPixmap()

        painter = QtGui.QPainter(self.pixmap)
        pen = QtGui.QPen(QtCore.Qt.white, 0, QtCore.Qt.SolidLine)
        painter.setPen(pen)

        width = self.pixmap.width()
        height = self.pixmap.height()

        numLines = 6
        numHorizontal = width//numLines
        numVertical = height//numLines
        painter.drawRect(0,0,height,width)

        for x in range(numLines):
            newH = x * numHorizontal
            newV = x * numVertical
            painter.drawLine(0+newH,0,0+newH,width)
            painter.drawLine(0,0+newV,height,0+newV)

        label = QtGui.QLabel()
        label.setPixmap(self.pixmap)
        label.resize(label.sizeHint())

        hbox = QtGui.QHBoxLayout()
        hbox.addWidget(label)

        self.setLayout(hbox)
        self.show()          

    def createPixmap(self):
        pixmap = QtGui.QPixmap("CT1.png").scaledToHeight(500)
        return pixmap

def main():
    app = QtGui.QApplication(sys.argv)
    Im = imageSelector()
    sys.exit(app.exec_())

if __name__== '__main__':
    main()

Answer 1

扩展您的QWidget派生类以覆盖mousePressEvent，然后根据实际鼠标位置找到图块并存储您要存储的像素图部分。只需将以下方法添加到您的类中，并填写pixmap剪切和存储的特定代码。

def mousePressEvent(event):
  """
    User has clicked inside the widget
  """
  # get mouse position
  x = event.x()
  y = event.y()
  # find coordinates of grid rectangle in your grid
  # copy and store this grid rectangle

如果你愿意，你甚至可以显示一个矩形橡皮筋，从矩形跳到矩形。对于此覆盖mouseMoveEvent。

def mouseMoveEvent(event):
  """
    Mouse is moved inside the widget
  """
  # get mouse position
  x = event.x()
  y = event.y()
  # find coordinates of grid rectangle in your grid
  # move rectangular rubber band to this grid rectangle

使图像的某些区域可选

1 个答案: